BIL 150 exam 2 || QUESTIONS & ANSWERS 100%
CORRECT.
In the figure, at the arrow marked II, what enzyme(s) are being utilized? correct answers host
cell DNA polymerase
Which of the following statements describes a cell that undergoes mitosis but not
cytokinesis? correct answers The cell contains more than one nucleus.
Observations of cancer cells in culture support the hypothesis that cancer cells _____. correct
answers Do not exhibit density- dependent inhibition
Which of the following phases of mitosis is essentially the opposite of premetaphase in terms
of the nucelar developement? correct answers Telophase
Antibiotics administered in human medicine work against bacterial infections by ______.
correct answers Interfering with an aspect of bacterial metabolism or structure that differs
from that of eukaryotic cells
Which of the following does not contribute to bacteria's ability to evolve rapidly? correct
answers Sexual reproduction
In an experiment, a microbiologist put equal numbers of each of the following organisms into
a flask of sterile broth, consisting mostly of sugar and a few amino acids. She then placed the
flask in the dark. Which of the following organisms would be most likely to survive? correct
answers Chemoheterotrophic bacteria
Genomes of viruses may consist of which of the following types of muscle acids? correct
answers All of the listed responses are correct (double- and single- stranded RNA and DNA)
Which of the following events occurs during the life cycle of phages? correct answers The
host cell usually dies, releasing many new copies of the virus.
Vaccines for viral diseases are ___ and help prevent infection by ___. correct answers
Harmless derivatives of pathogenic viruses; stimulating the immune system to mount a
defense against the actual pathogen
The process of phosphorylation is very important as a cellular mechanism for regulating
protein activity. Phosphorylation does this by ___. correct answers Activating or inactivating
proteins
What effect does ligand binding have on receptor tyrosine kinase proteins? correct answers
Ligand binding causes them to phosphorylate and form dimers.
A G-protein is active when ___. correct answers GTP is bound to it.
Second messengers tend to be water-soluble and small. This accounts for their ability to ___.
correct answers Rapidly move throughout the cell by diffusion.
, In prokaryotic genomes, groups of functionally related genes along with their promoters and
operators are found together in ____. correct answers An operon.
Both repressible and inducible operons control gene expression at the level of _____. correct
answers Transcription
Gene expression in bacteria is regulated primarily by ____. correct answers Controlling the
transcription of genes into mRNA
A cancer cell _____. correct answers Does not respond to the chemical signals that control
cell division
Although the number of genes in the human genome is surprisingly low compared to less
complex organisms, the number of possible products from those genes is greatly amplified by
_____. correct answers Alternate arrangements of exons from a primary transcript.
Which of the following is NOT a component of each monomer used to make proteins?
correct answers A phosphorus atom, P
What component of amino acid structure varies among different amino acids? correct
answers The components of the R-group
You disrupt all hydrogen bonds in a protein. What level of structure will be preserved?
correct answers Primary structure
Which of the following is the strongest evidence that protein structure and function are
correlated? correct answers Denatured (unfolded) proteins do not function normally.
If 14C-labeled uracil is added to the growth medium of cells, what macromolecule will be
labeled? correct answers RNA
If one strand of DNA has the sequence 5'ATTGCA'3, the other complementary strand would
have the sequence ___. correct answers 5'TGCAAT'3
A new organism is discovered in the forests of Costa Rica. Scientists there determine that the
polypeptide sequence of hemoglobin from the new organism has 72 amino acid differences
from humans, 65 differences from a gibbon, 49 differences from a rat, and 5 differences from
a frog. This data suggests that the new organism is more closely related to _____. correct
answers frogs than to humans.
The genetic code is essentially the same for all organisms. From this, one can logically
assume which of the following? correct answers A gene from an organism can theoretically
be expressed by any other organism.
A possible sequence of nucleotides in the template strand of DNA that would code for the
polypepetide sequence phe-leu-ile-val would be ____. correct answers 3' AAA-GAA-TAA-
CAA 5'
What amino acid sequence will be generated, based on the following mRNA codon
sequence?
CORRECT.
In the figure, at the arrow marked II, what enzyme(s) are being utilized? correct answers host
cell DNA polymerase
Which of the following statements describes a cell that undergoes mitosis but not
cytokinesis? correct answers The cell contains more than one nucleus.
Observations of cancer cells in culture support the hypothesis that cancer cells _____. correct
answers Do not exhibit density- dependent inhibition
Which of the following phases of mitosis is essentially the opposite of premetaphase in terms
of the nucelar developement? correct answers Telophase
Antibiotics administered in human medicine work against bacterial infections by ______.
correct answers Interfering with an aspect of bacterial metabolism or structure that differs
from that of eukaryotic cells
Which of the following does not contribute to bacteria's ability to evolve rapidly? correct
answers Sexual reproduction
In an experiment, a microbiologist put equal numbers of each of the following organisms into
a flask of sterile broth, consisting mostly of sugar and a few amino acids. She then placed the
flask in the dark. Which of the following organisms would be most likely to survive? correct
answers Chemoheterotrophic bacteria
Genomes of viruses may consist of which of the following types of muscle acids? correct
answers All of the listed responses are correct (double- and single- stranded RNA and DNA)
Which of the following events occurs during the life cycle of phages? correct answers The
host cell usually dies, releasing many new copies of the virus.
Vaccines for viral diseases are ___ and help prevent infection by ___. correct answers
Harmless derivatives of pathogenic viruses; stimulating the immune system to mount a
defense against the actual pathogen
The process of phosphorylation is very important as a cellular mechanism for regulating
protein activity. Phosphorylation does this by ___. correct answers Activating or inactivating
proteins
What effect does ligand binding have on receptor tyrosine kinase proteins? correct answers
Ligand binding causes them to phosphorylate and form dimers.
A G-protein is active when ___. correct answers GTP is bound to it.
Second messengers tend to be water-soluble and small. This accounts for their ability to ___.
correct answers Rapidly move throughout the cell by diffusion.
, In prokaryotic genomes, groups of functionally related genes along with their promoters and
operators are found together in ____. correct answers An operon.
Both repressible and inducible operons control gene expression at the level of _____. correct
answers Transcription
Gene expression in bacteria is regulated primarily by ____. correct answers Controlling the
transcription of genes into mRNA
A cancer cell _____. correct answers Does not respond to the chemical signals that control
cell division
Although the number of genes in the human genome is surprisingly low compared to less
complex organisms, the number of possible products from those genes is greatly amplified by
_____. correct answers Alternate arrangements of exons from a primary transcript.
Which of the following is NOT a component of each monomer used to make proteins?
correct answers A phosphorus atom, P
What component of amino acid structure varies among different amino acids? correct
answers The components of the R-group
You disrupt all hydrogen bonds in a protein. What level of structure will be preserved?
correct answers Primary structure
Which of the following is the strongest evidence that protein structure and function are
correlated? correct answers Denatured (unfolded) proteins do not function normally.
If 14C-labeled uracil is added to the growth medium of cells, what macromolecule will be
labeled? correct answers RNA
If one strand of DNA has the sequence 5'ATTGCA'3, the other complementary strand would
have the sequence ___. correct answers 5'TGCAAT'3
A new organism is discovered in the forests of Costa Rica. Scientists there determine that the
polypeptide sequence of hemoglobin from the new organism has 72 amino acid differences
from humans, 65 differences from a gibbon, 49 differences from a rat, and 5 differences from
a frog. This data suggests that the new organism is more closely related to _____. correct
answers frogs than to humans.
The genetic code is essentially the same for all organisms. From this, one can logically
assume which of the following? correct answers A gene from an organism can theoretically
be expressed by any other organism.
A possible sequence of nucleotides in the template strand of DNA that would code for the
polypepetide sequence phe-leu-ile-val would be ____. correct answers 3' AAA-GAA-TAA-
CAA 5'
What amino acid sequence will be generated, based on the following mRNA codon
sequence?
